Cloth-cutting knife.



J. APPELBAUM., CLOTH CUTTING KNIFE.

APPLICATION FILED NOV-2,1917.

T a- 0 i=2:

I m M I u: my W i T 5 mm A j I B- it; 5: q l; W i s i! E 1:)! I 2% i \Iji WITNESSES of? 6121mm .7 6 am M %r Afro/mm Patented June 25, 1918.

' UNITED STATES PATENT OFFICE.

JOSElH AI'IPIELBAUM, OF NEW YORK, N. Y., ASSIG-NOR TO TWIN BLADE CO. INC., 0! NEWV' YORK, N. Y.

CLOTH-CUTTING KNIFE.

harness.

Specification of Letters Patent.

Patented June 25, 1918.

To all "whom it may concern Be it known that I, Josnrn (\PPELBAUM, a citizen of the United States, and a resident of the city of New York, borough of Manhattan, in the county and State of New York, have invented a new and Improved cloth'fiutting Knife, of which the following is a full, clear, and exact description.

Among the principal objects which the present invention has in view are: to provide a knife for employment in conjunction with reciprocating machines of conventional type for cutting piled cloth; to provide a knife sharpened at opposite ends to augment the service period of said knife; and to'diminish the quantity of metal necessary to the manufacture of knives of the charac ter mentioned.

Drawings.

blade constructed in accordance with the present invention;

Fig 6 is a cross section of the same, the section being taken as on the line 6-45 in Fig. 5;

Fig. 7 is a side view of a further modified form of the invention;

Fig. 8 is a cross section thereof, the section being taken as on the line 8-8 in iili Fig. 7

Fig. 9 is a side view of a fragment of the head of a cloth-cutting machine showing the same as equipped with a knife constructed and arranged in accordance with the present invention.

Description.

Knives of the character herein disclosed are employed for cutting cloth when piled or laid up on a cutting table. As shown in the drawings, in Fig. 9, the knife is held in a rocking arm 15, being secured in a guide head 16 between the checks of which the knife reciprocates. T he head 16 has a base plate 17, which normally rests on the table partially under the cloth being out.

Machines of the character indicated and a cutting edge at -theopposite extremes of the blade.

The present invention has in view as its principal object, to reduce the number of knives needed and to economize in the time factor necessary to sharpening. Also to reduce, if possible, the labor expended in sharpeniilg.

ith the above-stated objects in view, the invention consists in providing cutting edges at opposite ends of each knife,

In Fig. 1, the cutting edges 18 are inclined upward from the p0int of junction with the front cutting or parting edge 19. From thepoints where-the edges 18 are arrested to the back edge of the blade 20, the stock of the knife remains to form shanks 21. In the angle between the shanks 21 and the edges 18 of the blade, is placed the holding bolt 22. which secures the knife to the arm 15. The edges 18, 23 and 24: of certain of the forms of knives shown in the drawings, are slanted, the object being to permit the knives to give what maybe termed a shearing cut, as they enter the pile of the cloth.

In Fig. 5 of the drawings, however, the knife shown has a straight edge 25. All of the knives have at the Front edge thereof cutting edges, though, as above stated, it will be recognized that said edges do notfunction as cutting members.

In Fig. 7 of the drawings, the edges 2& form junctions with short cutting front edges 26. When using this form of blade. the said blade is completelv reversed and the bolt 22 is inserted through the eyelets 27 provided therein. Though in some points this form of knife is desirable, an ob]cct1on does exist in that it is necessary to remove certain of the fastening members to permit the thread of the bolt 22 through said eyelots 27, whereas in the other forms of the knives, said bolt is slippededgewise into the recess between the cutting edge 18 and the shanks 21-, or into the edge-opening slots ofthe form of knife shown in Fig. 3, and in the angle 29 between the shank 21 of the knife shown in Fig. 5 and the straight edge 25 adjacent.

In all of the knives, however, it will be I found that cutting edgesare provided at both ends of the knife, in such manner that as one end becomes dull, the knife may be inverted in its operating position and present to the work being performed a fresh. cutting member.

newness Also it is obvious that when the knife is sharpened, both ends b ingcharpened at the same'time, the labor in this operation is curtailed or much reduced.

A knife as characterized having the oppo- I site ends thereof provided each with an end cutting edge and a recess for receiving a fastening bolt adjacent said end cutting edge, the longitudinal edges of said knife being sharpenedior separating the cloth in advance of the cuttin edges of said knife.

J OSEP APPELBAUM. 

